Thermophilic Anaerobic Digestion of Municipal Solid Waste in Combined Process and Sequential Staging
نویسنده
چکیده
Anaerobic digestion is an attractive method for waste stabilization with the potential generation of biogas and stabilized waste residue. Development of a treatment process at short digestion period with maximum process efficiency is the objective of this research. This paper presents the optimization performance between the combined anaerobic digestion and sequential staging concept in thermophilic solid state batch system. The former involves enhanced pre-stage flushing with microaeration and inoculum addition in methane phase. The latter involves leachate cross-recirculation between the old and new reactors directly without conducting pre-stage operation. The optimized process for combined anaerobic digestion showed that reducing pre-stage operation with maximum removal of organics from waste bed is beneficial. Moreover, the sequential staging concept offers an improved process over the combined anaerobic digestion. Improved waste stabilization with 86% and 79% of mass and volume reduction was achieved, respectively. Higher methane yield of 334 L CH4/kg VS with 86% VS reduction which is equivalent to 84% process efficiency was obtained.
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